Whoa!  That is a lot of height in a short distance. What if you brought in some fill and extended a nice slow slope to the back yard which would be easier going up and down?
Otherwise get the kids some dirt bikes and start training motocross 
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http://www.onlycubcadets.net/forum/s...ad.php?t=42646
 70, #1 cart. Brinly Cultivator. Some wheel weights  .
{125, 126, 2072-Sold~regrettably, 2284 60 inch Haban 325 deck., 451 snowblower, 2182-60 inch Haban 374 deck- "Money Pit", 401 Haban 54 inch dozer blade- rebuilt, 1440-down the road, Another 2182 for parts. Another 2284 for parts. 450 blower. 1812-sold, 2072 w/ Haban 374, and a 2182#3 w/ Haban 325}-------> All SOLD
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